Craig Topper 73046581a3 [APInt] Add setLowBits/setHighBits methods to APInt. ...

Summary:
There are quite a few places in the code base that do something like the following to set the high or low bits in an APInt.

KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);

For BitWidths larger than 64 this creates a short lived APInt with malloced storage. I think it might even call malloc twice. Its better to just provide methods that can set the necessary bits without the temporary APInt.

I'll update usages that benefit in a separate patch.

Reviewers: majnemer, MatzeB, davide, RKSimon, hans

Reviewed By: hans

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D30525

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297111 91177308-0d34-0410-b5e6-96231b3b80d8

2017-03-07 01:56:01 +00:00

..

llvm

[APInt] Add setLowBits/setHighBits methods to APInt.

2017-03-07 01:56:01 +00:00

llvm-c

[GVN] Initial check-in of a new global value numbering algorithm.

2016-12-22 16:03:48 +00:00